| (19) |
 |
|
(11) |
EP 0 374 879 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
14.08.1991 Bulletin 1991/33 |
| (43) |
Date of publication A2: |
|
27.06.1990 Bulletin 1990/26 |
| (22) |
Date of filing: 20.12.1989 |
|
| (51) |
International Patent Classification (IPC)5: C08F 6/24 |
|
| (84) |
Designated Contracting States: |
|
DE GB IT |
| (30) |
Priority: |
23.12.1988 JP 323424/88
|
| (71) |
Applicant: TOYO ENGINEERING CORPORATION |
|
Chiyoda-ku, Tokyo 100 (JP) |
|
| (72) |
Inventors: |
|
- Miyakawa, Hisashi
Mobara-shi
Chiba-ken (JP)
- Shinohara, Takanobu
Chiba-shi
Chiba-ken (JP)
- Maeda, Tetsuo
Urayasu-shi
Chiba-ken (JP)
|
| (74) |
Representative: Boeters, Hans Dietrich, Dr. et al |
|
Patentanwälte Boeters & Bauer,
Bereiteranger 15
81541 München
81541 München (DE) |
|
| |
|
| (54) |
Method for extraction of impurities in polymer |
(57) There is disclosed a method for extraction of impurities in polymer dispersion which
comprises bringing an extractant in contact with a polymer dispersion under a high
pressure, wherein the weight ratio of the polymer to the extractant is in a limited
range. According to the disclosure, a dispersion containing a polymer can be purified
efficiently to the degree to meet the market demand without damaging the basic performance
of the raw material.